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Bolts, Screws, Studs for High‐ Temperature Service CrMoVa Alloy Steel 1⁄4 thru 2 ½ Over 2 ½ thru 4 Over 4 thru 7 −− −− −− 105,000 95,000 85,000 125,000 115,000 100,000 SAE J429 Grade 1 No Grade Mark Bolts, Screws, Studs 60,000 Bolts, Screws, Studs ASTM A307 Grades A&B 60,000 STANDARD BOLT IDENTIFICATION MARKINGS
Hex Bolt Identification, Markings and Strength Chart. Additonal information on bolts is located at the bottom of the webpage. Note: Some bolts share identical head identification and have significantly different strengths.
This International Standard defines the symbols and gives descriptions of the dimensions of bolts, screws, studs and nuts for use in the appropriate product standards and drawings. NOTE 1 The figures of the fasteners in this International Standard are given only as examples.
10 de abr. de 2021 · The markings can be numbers, letters, slashes, dots, or an assortment of other marks. If you’ve ever wondered what those screw and bolt head markings mean, or if there’s some overarching logic to them, you’re in the right place. In this article, we’ll give you an overview of the following:
This chart helps to identify the grades of bolts using the identification marks on the bolt's head along with the strength and hardness of common grade bolts. Please note the bolt heads may also include the manufacturer's identification stamp, especially with high strength bolts.
Fastener manufacturers mark the heads of their bolts and screw with the identification mark. This is normally a trade mark but can be an abbreviation of their company name or a symbol. Traceability is important particularly in the case of fastener failure.
7 de sept. de 2022 · Bolt head markings are a combination of letters, numbers, or both to help you identify the fastener that you’re looking for. If you know how to read the markings, you can tell who made it, the material used to make it, and the tensile strength it can withstand.
